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The finite element simulation of lamb wave propagation in a cracked structure with coupled filed elements

Tashi, S ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.4028/www.scientific.net/AMR.463-464.618
  3. Publisher: 2012
  4. Abstract:
  5. Crack detection by Piezoelectric Wafer Active Sensors (PWAS) is one of the emerging methods of Non-destructive Evaluation (NDE). These sensors can assess the health state of the structure in far filed through the analyzing the high frequency Lamb wave propagation. As PWAS is the essential part of this method, simulation and modeling of these sensors and their interaction with the host structure, strongly affect the accuracy of results. In this study, unlike the previous works, in which some certain areas of the host structure were considered as a sensor and actuator, the direct simulation of electro-mechanical interaction of the PWAS and the host structure is modeled among modeling the PWAS with a FEM coupled-field element. After verification of the FEM analysis with theoretical group velocity of S 0 mode, capability of the S 0 mode in crack detection was examined. Different length and angles of the crack in an aluminum plate modeled. The crack growth effect was defined among a damage index by using the strain energy magnitude that received by sensor localized behind the crack. The result showed that transmitted energy from the cracks decreases as the crack length increases. In addition, as the angle crack to the sensor increases, the ability of sensor to crack detection will increase
  6. Keywords:
  7. Fem ; Aluminum plates ; Crack length ; Cracked structures ; Damage index ; Direct simulation ; Electro-mechanical ; FEM analysis ; Finite element simulations ; Group velocities ; High frequency ; Host structure ; Lamb Wave ; Lamb-wave propagation ; Non destructive evaluation ; Piezoelectric wafer active sensors ; Sensor and actuators ; Simulation and modeling ; Crack detection ; Cracks ; Damage detection ; Finite element method ; Mechanical actuators ; Piezoelectricity ; Ultrasonic waves ; Sensors
  8. Source: Advanced Materials Research, 7 January 2012 through 8 January 2012 ; Volume 463-464 , January , 2012 , Pages 618-623 ; 10226680 (ISSN) ; 9783037853634 (ISBN)
  9. URL: http://www.scientific.net/AMR.463-464.618